Muffler



FIG. 1 is a perspective view of a muffler showing our new design;

FIG. 2 is an elevational view of the muffler shown in FIG. 1;

FIG. 3 is a top view of the muffler shown in FIG. 1;

FIG. 4 is a view of the muffler taken from the left side of FIG. 2; and,

FIG. 5 is a view of the muffler taken from the right side of FIG. 2.

The broken line showing of environment in FIG. 4 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a muffler, as shown and described. 